Two cloud jobs get confused all the time: keeping your files in sync, and keeping them safe. They are not the same thing, and picking the wrong one leaves a gap you only notice when something goes wrong. Sync services (iCloud Drive, Dropbox, Google Drive) keep the same files available across your devices. Backup services (Backblaze, Carbonite, Time Machine) keep a separate copy you can restore after a loss. Most people end up wanting both, but for different reasons.
Sync vs backup: the difference that matters
Sync is about distribution. A change you make on your Mac shows up on your iPhone, iPad, or PC a moment later, because the service watches a folder and pushes every change everywhere. That is ideal for active work and for sharing.
Backup is about preservation. It keeps a point-in-time copy of your data somewhere separate, so you can get it back after a drive failure, a theft, or a mistake.
The trap is treating sync as a safety net. If you delete a file in a synced folder, that deletion travels to every device too. Version history can sometimes rescue you, but a real backup keeps an independent copy that survives the deletion. Sync mirrors; backup remembers.
Sync options for Mac
iCloud Drive
iCloud Drive is built into the Finder and is the most native option on a Mac.
- Open System Settings.
- Click your name at the top of the sidebar.
- Click iCloud, then iCloud Drive.
- Turn on Sync this Mac.
You can also turn on Optimize Mac Storage, which keeps frequently used files on the Mac and leaves the rest in the cloud until you open them. One honest caveat: the free tier is 5 GB, which fills fast once photos and device backups are involved. If you rely on it, a paid plan is usually necessary.
Dropbox, Google Drive, OneDrive
These run as separate apps that create a folder in your Finder. Anything you put in that folder syncs to the cloud and to your other devices. Using Dropbox as the example:
- Download and install the Dropbox app for macOS.
- Sign in to your account.
- A Dropbox folder appears in your Finder sidebar.
- Drag files into it to sync them.
They work this way because they run independently of macOS and support other platforms. macOS keeps each app inside its own sandbox, so the folder you fill is the data you choose to hand over.
Backup options for Mac
Backblaze
Backblaze is the simple choice: unlimited backup for one computer, running quietly in the background.
- Sign up on the Backblaze website.
- Download and install the app.
- Sign in. It starts backing up your Mac automatically.
- Exclude large files or folders in settings if you want to.
Carbonite
Carbonite offers tiered plans, from basic file backup to fuller system protection, with some plans covering an external drive alongside the cloud copy.
- Choose a plan on the Carbonite website.
- Download and install the app.
- Select what to back up. The whole computer is the safe default.
- Let it run.
Time Machine (local)
Time Machine is not a cloud service, but it belongs in any Mac backup plan. It backs up to a local external drive and makes recovery fast, from a single deleted file to a full system restore.
- Connect an external drive.
- Open System Settings.
- Click General, then Time Machine.
- Click Add Backup Drive, select your drive, and set it up.
For the settings that actually decide whether a Time Machine backup saves you, see Set up Time Machine the right way.
The 3-2-1 rule
The standard data-protection strategy is simple to remember: keep 3 copies of your data, on 2 different kinds of media, with 1 copy offsite. A local Time Machine backup covers one media type, a cloud backup like Backblaze covers the offsite copy, and your working files on the Mac are the third. Sync alone does not satisfy it, because a deletion or corruption spreads instead of staying contained.
A practical hybrid setup
For most people the sensible answer is both, layered:
- Turn on iCloud Drive for the folders you actively work in, so your current files follow you across devices.
- Connect an external drive and let Time Machine back up the whole system, including your iCloud Drive files.
- Add an offsite cloud backup such as Backblaze for anything irreplaceable.
This gives you quick access through sync and a real, isolated recovery path through backup.
If you lose everything
If a Mac is stolen or dead, you start with a new one and rebuild:
- Restore from your Time Machine drive to bring back the system as it was.
- Sign in with your Apple ID so iCloud Drive files download.
- Sign in to Dropbox or Google Drive to resync those folders.
- If you used a cloud backup like Backblaze, start a restore from it.
The exact steps depend on the services you chose, so the real preparation is knowing where each piece of your data lives before you ever need it.
FAQ
What is the difference between sync and backup?
Sync keeps the same files current across your devices. Backup keeps a separate, point-in-time copy you can restore after a loss.
Is iCloud Drive a backup?
No. It distributes your files, so a deletion spreads to every device. A backup keeps an independent copy that survives the deletion.
Can I use sync and backup together?
Yes, and most people should. Sync handles daily access; backup handles recovery.
Is Time Machine enough on its own?
It is a strong first layer, but it is local. Pairing it with an offsite cloud backup follows the 3-2-1 rule and protects against theft or damage to the drive itself.